Subject: Re: Poor git write performance to NFS

From: Daniel Steinborn <[email-masked]>
Date: Thu, 22 Oct 2015 15:04:16 +0200

Hi,

thank you for your answer.
I removed the git Debian package and compiled v2.6.2 manually. The 
performance is much better now (on the same level als v1.7.12.4).
We opened a Debian bug report, to request a git version >= 2.6 to be 
backported to jessie: 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=802661

The issue is now solved for us, thanks again for your quick response.

Best regards,
Daniel Steinborn

Am 21.10.2015 um 20:20 schrieb Junio C Hamano:
> Daniel Steinborn <[email-masked]> writes:
>
>> currently we are experiencing poor write performance when a repository
>> is pushed to a nfs volume. Interestingly, this seems to be a problem
>> in newer git versions:
>>
>> v1.7.12.4: Very good performance
>>
>> v2.1.4: Bad performance, up to 6 times slower
>>
>> Are there any changed default settings or new features that can be the
>> reason for that problem?
>>
>> Please ask for specific details if they are neccessary.
> Between 1.7.12.x series and v2.1.4, there are more than two years'
> worth of changes, so it is unreasonable for anybody to expect that
> such a question can be answered in a meaningful way.
>
> Have you tried more recent versions yet?  2.1.x series is over a
> year old, and I am reasonably sure there have been tons of "earlier
> we did X for correctness, which unfortunately made things slower,
> and this ensures the same correctness in a different way that is
> much more performant" fixes since then.

-- 
Daniel Steinborn
Leibniz-Rechenzentrum
Boltzmannstraße 1
85748 Garching bei München